Lathe.



PATENTED MAR. 20, 1906. J. J. PBALING.& J. D. HARRISON.

LATHE.

APPLIGATION'FILBD SEPT. s. 1904.

3 SHEETS-SHEET 1.

No. 815,733; A PAT'lamIED'MARZO LJ. PBALING- (a J; D. HARRISON.

LATHE. APPLICATION FILED SEPT, a. 1904.

3 SHEETS-SHEET 2.

3 SHEETS-SHEETS.

PATENTBD M1520, 1906. J. J. PBALING @L J. n. HARRISON.

LATHB. APPLICATION FILED SEPT. s. 1904.

f This'vl mention relates te' lathes prov'ideid With Ineens ferennding. `end ,the l-ihe'fendhee feriteebjeateainishnreiatiiefwahmeang esteehemtyfbe eeneenienely deiveenffemfe i temer-sheet retetetlymeeetee telereeeeee fet;nkeeeepereieeitheileeteaeee., x e' It'hasbeen 'a common lpractice to :a Smell grinding, .er like. ,derieeen d .lethleffet zoi'grindjng' 'the Work-piece' or materiale/the .letthe .btltth deYiee ,hesnsnellybeen drvena hn QhtG-Sldft fnloveftndrthollyhepd t t .neeeeeegieethemeenleehenient feitenehez f .-nrevdejd fWhithEis. integrel e'tenhedenhetentielfpetfetthelathe, meenemen y 'fleeting et @enteraen .tty eeeeeeeteeeeeegs eenieeey the. .l ,-.eteekefthelethe'end-thl enter-.theft se detention Pellertfnnl. gwhie. I.e .grinding W detti-,eel deren; The. .eennter-ehett .Se enttttletedtthdt thedtirng-Pnlley thereen imei: .be edineted laterally,threnghwvidehneft" 'lxed $0 de' 'te Pnt it yin lineten belt.- 55 lhlextnth; the".r nllerldtlthe erindinadeviee-I Means.' AIrefalfSOj proyided according to this; invention to; enable device to be driven at aA relatively high speed, although` driven through theteetheftneeheniern Whieh;

40 drilves the spindle in'ltle-shgeadstoclg of the!y lat e. In the accom anying drawings, Which illustrate an embo 'ment of the invention, Figure 1 is a front side elevation of a lathe provided With the invention. Fig. 2 is a plan ofl the same. Fig. 3 is an end elevation as seen from the left in Fig. 1. Various details oi the lathe are omitted from this figure, as theyare not connected with the present invention.

Fig. 4 is a detached side elevation of the eX- tensi-ble counter-shaft drawn to a larger-scale than the principal views.` Figs. 5 and @rare enlarged sectional detail views of this shaft, illustrating the clamping devices.` Fig. 7 is f Specification ofLettersPatnt'. t 'Patented' MaI-011,20, 1906." t 1 hehehehe.eeemefenetieenweee- Shows. edninonfm Ot erinChing-t.00L e The nventen Sie herein. lSherrill .ee Operetivelyy e-Onneeted With ,e ferne jef lethe .Where- A y jleweed;but.Sneheletheferrneinepertin 'tionfor .'aU patent .in Grr'eaitl Britain has beenitself ditthe,present.nrentien-, .f

l5, endlheetndnnted init. theheed-Steeke, Whlfeh ie eapehle et5 being raised endlewered in ehnewn Wer hynleene indieated et. 3 and TheL letherhe'd e iSI enppertedon e' pede sftal isbclamped` .fastbyl a screw A.2.4 A, vernier-Y .Seele 2de, enpleyed. te indeete lthe extent ef .elevet'tdn-` A ,trat/eline Carriage@ `is moved te and flieht? e .eenen fw n..tl.1e lathe-bea end fdnfthis Oelldge .ienteunted ehelder u forithe ,.gtindingzteelf- --Tln'sf devine. maybe :an .oltdnerrteel 'Jeff Ewell-'known kind7 1 es. .Seen in t Fg- 9@ 1 In' the pedestal its. mounted the .main

.eerie @.Werllnieeeishpbrt for, usej when the e,y and .a repre-rI In entablabrackete b onv menthe-:Beef is .rotatably .mounted e1 tubular, counter-.shaft c,

on Whichare A'secured acme-,pulleys d, one ,of Whichislconnected by. a belt giwithkthe, conepulleys. s ,ontthe lathefspindlenand a1 'pulley d', which .ieteonneeted Joya belt p .Wththe jdffs.eeheiftf, `which is ,eplined sothatitamust Vt0.titte.' .Withi- `the .eenntereshaft; Eand. on. this @hatt titillerv emvhieh .may be. adjusted, through the medium of the sl'idability of its shaft, to proper alinement With the pulley 8 of the grinding-tool, such as that seen in Fig.

9, for example,y wherein -9 is the Wheel of .the

ICO

position it will ordinarily occupy when not in use and dotted lines in one of its operative positions. When the shaft f has been properly adjusted to the position desired in the counter-shaft a, it is secured in that position by means illustrated in detail in Figs. 5, 6, 7, and 8. The shaft f has a spline g, which plays in a keyway in the tubular shaft a, anc

latter has a tapered, screw-threaded, and slitted end portion k, on which screws a milled nut 7L, that clamps the shaft a, firmly on the shaftf at that point. At its inner end, or that end which will be inside of the shaft a when the pulley e is in its Working position, the

Yshaft f is made hollow or bored out for a suitable distance, and this tubular portion j is y slitted,s that it may expand, and internally screw-threaded and coned to receive a screw m, provided with a coned expanding -head m', which when driven in expands the tubular slitted portion of the shaft f in the hollow shaft a and binds it fast in the latter. The screw m may have in it a recess n to receive a suitable key for turning the screw.

Obviously the lathe may be driven by any power desired. For certain operations it is found desirable for the main pulley or flywheel on the lathe-shaft 6 to carry two belts, one for driving the counter-shaft a and the other for driving the lathe-spindle. Hence the three pulleys o maybe employed fordriving the lathe-spindle, and the cone-pulieys on the counter-shaft are for use in connection with the cone-pulleys on the lathe-spindle.

The counter-shaft a is preferably mounted on a level with the head-stock spindle when this latter is raised to an extent equal to half of its full rise. By this arrangement it has been found in practice that it is possible to raise or lower the head-stock without providing for any special belt-tightening device, as the increase in distance between the counter-shaft a and the head-stock spindle r when the latter is raised or lowered from its midway position to its highest or lowest position is not sufficient to appreciably affect the power-transmitting properties of the belt, as this latter is capable of stretching the small amount necessary. A concurrent advantage which accrues from the above arrangement and which is of importance is that the headstock spindle can be driven at a lower speed relative to the fly-wheel or pulley o than is usual, owing to the head-stock spindle being speeded down through the pulley d. This is a considerable advantage when driving a lathe by foot, as sometnnes when it is required to move the work-piece at a slow speed it is exceedingly difficult to keep the fly-wheel in rotation at the slow speed required. Although by means of this device the head-stock spindle is slowed, the countershaft is driven at a high speed, as is always found preferable for driving grinding and like devices.

The usual idlers and tension-rollers may be employed with the belts; but these are common and form no part of the present invention.

Although the invention has been described as operating in connection with asomewhat special but known form of lathe, it will be obvious that its application is not restricted to this form of lathe, which has a rising-and-falling head-stock.

Herein for convenience of description the tubular shaft a has been called the countershaft and the pulley-shaft f referred to as slidable therein, but practically the two constitute a telescopic counter-shaft, of which fis the extensible member, carrying the driving-pulley e.

Having thus described. our invention, we claim- In means for the purpose specified, the combination with the lathe-bed, atraveling carriage thereon, means for moving said carriage axially of the bed, and brackets on the bed, of a telescopic counter-shaft rotatable in said brackets and having its axis parallel with the axis of thelathe-bed a driving-pulley on the elongating member of the countershaft and capable of being set opposite to the carriage on the bed, and means for securing together the members of the counter-shaft when the adjustment has been effected.

In witness whereof we have hereunto signed our names, this 23d day of August, 1904, in the presence of two subscribing witnesses.

JOSEPH JOHN PEALING. JAMES DAVIES HARRISON Witnesses:

HUBERT PUMPHREY,

J. MCLACHLAN. 

